A great leap towards reconciliation is made under the pontificate of Pope Francis: among Emperors, Popes, Roman nobles, and great saints, stands a small but central Piazza Martin Lutero: the German theologian of the Reformation is present now among them. He has the “right to exist” on the map. The Catholic Church is, finally, saying: “I hear what you say”, and gives him the right place to be present in her centre.

Pope Francis, one would say, is fond of the geographical/geometrical word “centrality.” He is the Pontifex Maximus, the centre of the Roman Curia, by definition the central government of the Church, thus he is...